An uncompromising commitment to quality

Safety requires outstanding quality. With a strict, certified quality
management, exclusive in-house assembly and carefully chosen
suppliers, Gelbau consequently focuses on uncompromising product
quality “Made in Germany”.

First-class materials are the basis for the maximised functionality and long life cycles of our products. With the two rubbers NBR and EPDM, Gelbau has opted for materials that make an important contribution to the applicational safety.


Our special-quality rubber

NBR – Nitrile butadiene rubber

Synthetic special-quality rubber with high swell-resistance to fuels, oil, grease and aliphatic solvents. Not recommended in conjunction with aromatic solvents, pure benzene, toluene, and ozone or sunlight exposure.

EPDM – Ethylene propylene diene monomer

Synthetic all-purpose rubber with excellent resistance to aging, ozone, sunlight, weather conditions and other environmental factors as well as alkalis, corona and various dyes and chemicals. Not resistant to hydrocarbon solvents, turpentine or petrol.

  • Internat. abbreviation
  • Hardness range / shore
    40 to 90
    35 to 90
  • Tear resistance N/mm² at +20 °C
    up to approx. 20
    up to approx. 20
  • Tensile deformation
    up to approx. 450%
    up to approx. 450%
  • Rebound resilience at +20 °C
  • Resistance to wear and abrasion
  • Resistance to permanent deformation
  • General resistance to weather conditions
  • Resistance to ozone
  • Resistance to oil
  • Resistance to fuel
  • Gas impermeability
  • Resistance to solvents
  • General resistance to acids
  • Dielectric characteristic
  • Thermal stability short-term
    approx. −40 to +150 °C
    approx. −50 to +170 °C
  • Thermal stability longer-term
    approx. −30 to +120 °C
    approx. −30 to +140 °C
  • Resistance to steam